Sunday driver

From Sunday +‎ driver, Sunday being a popular day for leisure driving.

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Sunday driver (plural Sunday drivers)

1. (idiomatic) One who drives slowly or inexpertly, as for leisure or sightseeing.

   I was eager to get there, but I got stuck behind one Sunday driver after another on that trip.

   • 1990 July 30, Davide Thigpen, “Real-Life Days of Thunder”, in Time:

     Wallace is hardly your typical Sunday driver out on a jaunt in the countryside.

2. (dated) One who drives infrequently, and often poorly.